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Key to the species of the genus Stemonitis 1. Columella ending with expansions....................................................................................................................................................2 - Columella ending without expansions...............................................................................................................................................6 2. Spores reticulate............................................................................................................................................... S. amphorocolumella - Spores not reticulate..........................................................................................................................................................................3 3. Columella ending with membranous cup-like expansions........................................................................................... S. flavogenita - Columella ending with widened expansion at the apex....................................................................................................................4 4. Capillitium without free ends.................................................................................................................................... S. sichuanensis - Capillitium with free ends.................................................................................................................................................................5 5. Spores 9–11 µm diam., spinulose......................................................................................................................... S. capillitionodosa - Spores, 7–8 µm diam., large warts and small warts......................................................................................... S. pseudoflavogenita 6. Spores reticulate................................................................................................................................................................................7 - Spores not reticulate........................................................................................................................................................................11 7. Reticulum with large or medium meshes on spores..........................................................................................................................8 - Reticulum with small meshes on spores............................................................................................................................................9 8. Reticulum black, with 2–4 meshes across the spore. Spores dark brown in mass, red-brown in transmitted light, 8–9 µm diam......................................................................................................................................................................................... S. inconspicua - Reticulum with 6 meshes across the spore. Spores bright lilac-brown in mass, pale lilac-brown, light reddish or pinkish brown in transmitted light, 6–8 µm diam................................................................................................................................... S. virginiensis 9. Reticulum with 8–11 meshes across the spore. Spores reddish-brown to dark brown in mass, brownish-grey in transmitted light, 8–9 µm diam..................................................................................................................................................................... S. marjana - Reticulum with 6–9 meshes across the spore..................................................................................................................................10 10. Spores gray-purple, brown-purple in mass, purple-brown in transmitted light, 7–9 µm diam., sporocarps 6–20 mm total height................................................................................................................................................................................................... S. fusca - Spores dark brown in mass, purple gray in transmitted light, 8–9 µm diam., sporocarps 3 mm total height.................. S. foliicola 11. Spores in clusters................................................................................................................................................................ S. uvifera - Spores free.......................................................................................................................................................................................12 12. Sporocarps large or medium 7–20 µm............................................................................................................................................13 - Sporocarps small up to 5 (7) µm.....................................................................................................................................................16 13. Sporocarps light brown, spores 5.0–7.5 µm diam., with very fine pale warts seen by oil-immersion.............................. S. axifera - Sporocarps dark brown to black......................................................................................................................................................14 14. Capillitium without internal net, surface net with large meshes 60–275 µm diam.................................................... S. rhizoideipes - Capillitium with internal and surface net........................................................................................................................................15 15. Surface net irregular, many expansions in the axils of the surface net capillitium............................................................... S. plana - Surface net without many expansions in the axils of the surface net capillitium........................................................... S. splendens 16. Sporocarps light brown....................................................................................................................................................................17 - Sporocarps dark brown to black......................................................................................................................................................19 17. Stalk long, 1/3–1/2 of the total height................................................................................................................................ S. pallida - Stalk short, 1/5 of the total height....................................................................................................................................................18 18. Sporocarps gregariously tufted on a common hypothallus. Hypothallus a rather thick, dark red brown membrane, darker at the stalk bases.......................................................................................................................................................................... S. graciliformis - Sporocarps in groups. Hypothallus membranous, inconspicuous.................................................................................. S. herbatica 19. Spores small, up to 7 µm diam......................................................................................................................................... S. farrensis - Spores large 8.5–12.5 µm diam.......................................................................................................................................................20 20. Spore-mass black. Spores with long warts, up to 0.8 µm....................................................................................... S. mussooriensis - Spore-mass pale brown. Spores with short warts............................................................................................................................21 21. Capillitium smooth, not bearing spines internal. Internal net with 3–4 meshes across the radius..................... S. mediterraneensis - Capillitium lax, with short thick, protrusions on the outside, rather wide, flat to rounded, all the axils rounded and with membranous expansions. Internal net with 1–2 meshes across the radius............................................................................................... S. laxifila |
